668685578760 has 96 divisors (see below), whose sum is σ = 2226233744280. Its totient is φ = 173966976000.

The previous prime is 668685578723. The next prime is 668685578779. The reversal of 668685578760 is 67875586866.

668685578760 is a `hidden beast` number, since 6 + 6 + 8 + 6 + 8 + 557 + 8 + 7 + 60 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 261429735204 + 407255843556 = 511302^2 + 638166^2 .

It is a Harshad number since it is a multiple of its sum of digits (72).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 22637191 + ... + 22666710.

Almost surely, 2^668685578760 is an apocalyptic number.

668685578760 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

668685578760 is an abundant number, since it is smaller than the sum of its proper divisors (1557548165520).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

668685578760 is a wasteful number, since it uses less digits than its factorization.

668685578760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45303959 (or 45303952 counting only the distinct ones).

The product of its (nonzero) digits is 812851200, while the sum is 72.

The spelling of 668685578760 in words is "six hundred sixty-eight billion, six hundred eighty-five million, five hundred seventy-eight thousand, seven hundred sixty".